The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 1992
Filed:
Jun. 07, 1990
Motoaki Matsumoto, Kanagawa, JP;
Hideaki Kimura, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A preamplifier providing adequate boost even to weak and small input currents, and thus achieving favorable gain and signal-to-noise ratio. An input current is converted to a voltage, which is provided to a differential amplification section. A phase-adjusted version of that voltage signal also is provided to the differential amplifier, the differential amplifier thus outputting an amplified signal based on the phase difference between its inputs. The preamplifier may be incorporated on a single chip, using MOS transistors or gallium arsenide techniques. A level clamping device may be provided in the event that the input current exceeds a predetermined value. The inventive preamplifier also may be incorporated advantageously into a waveform shaping circuit.